Use this cinematography or projection calculation to plan image geometry, exposure, timing, storage, film footage, or presentation from explicitly stated camera and display parameters.

Actual Open Seconds (s)

Required number input.

Commanded Seconds (s)

Required number input.

Measured shutter efficiency percentage from actual open time divided by commanded exposure time. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Efficiency Percent (%)

The resulting efficiency percent returned as a number.

• Shutter-angle, frame-rate, blur, flicker, and rolling-shutter estimates assume defined exposure timing and scan direction. Sensor readout mode, light modulation, synchronization, motion path, and dropped or duplicated frames affect the observed artifact.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Confirm critical values with the actual camera, lens, codec, projector, and delivery specification, then run a camera or projection test under representative conditions.

• Exposure Value EV

  Exposure value at ISO 100, EV=log₂(N²/t), from f-number N and shutter time t in seconds.

• Bellows Exposure Compensation

  Additional exposure in stops from a measured bellows exposure factor: log₂(factor).

• Flicker Frequency

  Flicker frequency from observed light-output cycles over a measured time interval.